Cisco Interface Input Errors and Giants

How do I resolve interface errors?

r6bu200_cat4506a.r6bu.200#sho int tenGigabitEthernet 2/2
TenGigabitEthernet2/2 is up, line protocol is up (connected)
  Hardware is Ten Gigabit Ethernet Port, address is e8b7.48cd.216c (bia e8b7.48cd.216c)
  Description: cat6509a.x7y3.200
  MTU 1500 bytes, BW 10000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 10Gb/s, link type is auto, media type is 10GBase-SR
  input flow-control is on, output flow-control is on
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:02, output never, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 11538000 bits/sec, 6464 packets/sec
  5 minute output rate 7654000 bits/sec, 4696 packets/sec
     199689853 packets input, 51594226394 bytes, 0 no buffer
     Received 26195241 broadcasts (21721329 multicasts)
     0 runts, 502 giants, 0 throttles
     502 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 input packets with dribble condition detected
     141512592 packets output, 30945681421 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out


r6bu200_cat4506a.r6bu.200#sho int tenGigabitEthernet 2/3
TenGigabitEthernet2/3 is up, line protocol is up (connected)
  Hardware is Ten Gigabit Ethernet Port, address is e8b7.48cd.216d (bia e8b7.48cd.216d)
  Description: cat6509a.x8y3.200
  MTU 1500 bytes, BW 10000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 10Gb/s, link type is auto, media type is 10GBase-SR
  input flow-control is on, output flow-control is on
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:05, output never, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 14130000 bits/sec, 6987 packets/sec
  5 minute output rate 11616000 bits/sec, 5999 packets/sec
     1744442977 packets input, 2398579286032 bytes, 0 no buffer
     Received 26036040 broadcasts (21860444 multicasts)
     0 runts, 62641 giants, 0 throttles
     62641 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 input packets with dribble condition detected
     288186653 packets output, 59060817765 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out
EvolutionzzAsked:
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Zephyr ICTCloud ArchitectCommented:
Giant errors would/could indicate MTU issues, did you check if all sides have the same MTU configuration? All 1500/1518 or even 9000 for jumbo ... ?
EvolutionzzAuthor Commented:
I did.  These interfaces  are trunks and mtu is 1500.
Don JohnstonInstructorCommented:
What is connected to these ports?

It would appear that the connected devices either have their MTU's set to greater than 1,500, or they have jabbering interfaces (which seems unlikely).
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Zephyr ICTCloud ArchitectCommented:
Yes, still convinced something in the chain isn't happy with the MTU being used. Check everything that is connected to the switches, also possible virtual systems ...
EvolutionzzAuthor Commented:
There's  a lot a VM's on the network using those interfaces and associated port channels.  So I need to verify  every device  and VM using those interfaces and port channels?
Don JohnstonInstructorCommented:
If the physical device connected to these ports is a server running VMware, then yes. You may need to check the MTU's on all the vNIC's.  

Although considering this is a tengig interface, and it looks like your VM's are running large MTU's, I would increase the MTU on the switch interfaces.
Zephyr ICTCloud ArchitectCommented:
I concur with Don Johnston, why not increase the MTU on the switch interfaces?
EvolutionzzAuthor Commented:
How would I determine  what to increase the mtu to? I would still need to determine  what the mtu for the VM's are, correct?
Don JohnstonInstructorCommented:
How would I determine  what to increase the mtu to?
Look at the vNIC and vSwitch configuration.  The MTU's are defined there.
I would still need to determine  what the mtu for the VM's are, correct?
Yes, but typically, 9000 is used for larger MTU's these days.
EvolutionzzAuthor Commented:
Ok.  Thanks for the tips.
EvolutionzzAuthor Commented:
Last question,  how do I determine the error rate and what rate is above the acceptable rate for input errors and CRC errors?
Don JohnstonInstructorCommented:
first you have to clear the counters since you have no way of knowing when any errors occured.

Use the "clear counters" command.

Then after a suitable period of time, check the interface stats.  For CRC and input errors, IIRC .01% is the threshold for being concerned. So errors/total packets=error rate.  As long as you're under .0001, you're good.

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EvolutionzzAuthor Commented:
for TenGigabitEthernet2/3 the input error rate would be 62641 divided by 14130000 which is   4.433 %??????


Hardware is Ten Gigabit Ethernet Port, address is e8b7.48cd.216d (bia e8b7.48cd.216d)
  Description: cat6509a.x8y3.200
  MTU 1500 bytes, BW 10000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 10Gb/s, link type is auto, media type is 10GBase-SR
  input flow-control is on, output flow-control is on
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:05, output never, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 14130000 bits/sec, 6987 packets/sec
  5 minute output rate 11616000 bits/sec, 5999 packets/sec
     1744442977 packets input, 2398579286032 bytes, 0 no buffer
     Received 26036040 broadcasts (21860444 multicasts)
     0 runts, 62641 giants, 0 throttles
     62641 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 input packets with dribble condition detected
     288186653 packets output, 59060817765 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out
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